How long have you owned it?

On February, 11th is the second birthday of the bike ..

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___/\___/\___/\___ the s u r f b o a r d of the K u r p f a l z is the r o a d b i k e .. oSo >>

Is this a 3T fork? 3T uses a similar insert that is glued with two part epoxy. I've had the bond fail several times on different bikes; it always starts out looking like this. Tap it with a hammer, and it will push down.

So you need to pull it out, remove as much dried epoxy as possible (use sandpaper to remove the dried epoxy from the insert and lightly sand the inside of the steerer), clean the insert and inside of steerer with isopropyl, and rebond with 2 part epoxy.

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2015 USAT Long Course National Champion (M50-54)

poor mixing of 2 part epoxy and or finger grease on the insert or tube before application of epoxy.

I had one start to pull out once, but it also took the carbon fro steerer with it as a result of a car hitting me

In general, I agree this could be a cause. In my case, the failures took a few years each, on cross bikes that were ridden quite harshly. And I have a lot of experience in carbon fabrication, so I am relatively sure my mixing and cleanliness were proper.

If this happens quickly on a bike not exposed to harsh surfaces, then I agree with you that this is due to faulty installation.

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2015 USAT Long Course National Champion (M50-54)

We can't apply any force to move the insert, it is bomb proof fixed in the steering tube. The mechanic of my trust and myself start to believe we just made it like that. There was never any problem until the head set had to be replaced. Thanks for the thoughts, sorry for the time, it looks like our brains build a trap that worked ..

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___/\___/\___/\___ the s u r f b o a r d of the K u r p f a l z is the r o a d b i k e .. oSo >>